. Bulletin of the Natural History Museum Zoology. ALLEN, SANDERS AND F. HANNAH Yoldiella similiris (new species) Type locality. Atlantis II, Cruise 60. Sta. 236, Argentine Basin, , 36°'S, 53°'W-36°'S, 53°'W, Epibenthic Trawl, 409-518 m. Type specimen. Holotype: BM(NH) 1992028. Paratypes: in collection held by J. A. Allen. Material. Cruise Sta Depth (m) No Lat Long Gear Date ARGENTINE BASIN Atlantis II 236 409- 60 518 237 993- 1011 86 5 36°'S 'S 36°'S 53°'W 53°'W 53°'W ES ES Restricted to shallow slope depths in
. Bulletin of the Natural History Museum Zoology. ALLEN, SANDERS AND F. HANNAH Yoldiella similiris (new species) Type locality. Atlantis II, Cruise 60. Sta. 236, Argentine Basin, , 36°'S, 53°'W-36°'S, 53°'W, Epibenthic Trawl, 409-518 m. Type specimen. Holotype: BM(NH) 1992028. Paratypes: in collection held by J. A. Allen. Material. Cruise Sta Depth (m) No Lat Long Gear Date ARGENTINE BASIN Atlantis II 236 409- 60 518 237 993- 1011 86 5 36°'S 'S 36°'S 53°'W 53°'W 53°'W ES ES Restricted to shallow slope depths in the Argentine Basin. Depth range: 497-1011 metres. Shell description (Figs. 13, 15-17). Shell small, subovate, moderately inflated, smooth, fine irregular concentric lines, inequilateral; umbos small, anterior of midline, inwardly directed; antero-dorsal margin convex, curves evenly to ante- rior margin, ventral margin convexity increases slightly poste- riorly, posterior margin obliquely subtruncate, postero-dorsal margin approximately straight, gently sloping, posteriorly forming a blunt angle, dorsal margins on either side of umbo form an acute edge; hinge plate well-developed, anterior slightly arched, posterior almost straight, 11 anterior and 12 posterior strong angular teeth in individual mm long; ligament amphidetic, small secondary external periostracal extensions on either side of umbo, internal primary ligament moderately large, extends below hinge line. Prodissoconch length: 198 Maximum recorded shell length: mm. The shell and internal morphology of Y. similiris is very similar to that of Y. lucida The following differences are noted:- The umbo of Y. similiris is slightly more anterior, this. Fig. 13 Yoldiella similirus. Lateral views of shells from the right side and a hinge plate of a left valve. Specimens from Sta. 236 Argentine Basin. (Scale = mm). Fig. 14 Yoldiella similiris. Lateral view of internal morphology from the right s
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